The Spain international striker has headed to Turin for a second spell with the Serie A champions, with the option of a second season on loan after the 2020-21 campaign.
As part of the deal, Juventus will pay an initial €10 million (£9m/$11m) fee for the season and another €10m if they want to retain Morata for another year, while there is a €45m (£40m/$52m) option included to make the transfer permanent after the first season.